how long do you think it will be___china sends a manned spaceship to the moon?a whenb before用哪个?

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how long do you think it will be___china sends a manned spaceship to the moon?a whenb before用哪个?
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how long do you think it will be___china sends a manned spaceship to the moon?a whenb before用哪个?
how long do you think it will be___china sends a manned spaceship to the moon?
a when
b before
用哪个?

how long do you think it will be___china sends a manned spaceship to the moon?a whenb before用哪个?
B before
因为跟的是一段时间(HOW LONG)
如果用when要跟确切的时刻